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1 Cultivation of strong seedlings: The effective growth time of onion seedlings is 80-90 days, in order to reach the colonization standard. Choose excellent varieties with strong resistance and good commercial properties, such as Zhangqiu Scallion Series, Gaoshoubai, Huaxian Gusong, Sanyeqi, and Japanese Onion. The seeds are sterilized by seed soaking and seedling raising. Temperature control and humidity control, strengthen fertilizer and water management, and safely overwinter.
In the spring of the next year, before the rainy season, when the shallots grow to 3 leaves, it is necessary to take time. After the seedlings, timely watering and topdressing, the first top dressing in late April, combined with watering, can apply urea 150 kg / ha, pay attention to not use ammonium bicarbonate top dressing, so as not to burn the onion leaves. In the future, water should be poured once every 7 to 10 days, and water should be poured twice to apply fertilizer once. The attack is fierce, and each application of urea is 200-300 kg/ha. In mid-May, transplanting and planting can be carried out.
Spring sowing seedlings were first watered and fertilized from the end of April, each time applying 150 kg/ha of urea, or applying 4,500 to 7,500 kg/ha of decomposed manure. The growth of the onion seedlings can be increased to 300 kg/ha. In the next 10 days, water should be poured once every 10 days. In the first half of June, watering and fertilization should be stopped, and seedlings and seedlings should be planted to increase the onion fiber and enhance the ability to resist wind and disease. After 20 to 25 days of seedling refining, it can be fertilized and watered 10 days before planting. This fertilizer lays a good foundation for transplanting and returning to green, also known as “gifting†fertilizer.
In order to strengthen the disease prevention ability of onion seedlings, it is possible to use foliar spray to add potassium fertilizer to the foliar spray. 110 kg of grass ash per hectare is dissolved in 225 kg of water, and the filtrate is 2250 kg of water, sprayed on the leaves, once every 7 days, continuously. Spray 2 to 3 times. It can also be sprayed with 0.2% potassium dihydrogen phosphate solution to make the onion seedlings grow stronger, and the disease resistance and wind resistance are strengthened.
2 heavy application of base fertilizer, timely planting: production practice proves that fine land preparation, early planting green onions, is the basis for high yield. Whether it is autumn sowing seedlings or spring sowing seedlings, it is necessary to plant the seedlings early, and to plant the seedlings in the rainy season and high temperature, and the roots are well developed.
It is necessary to select plots that have not been planted with onion and garlic within 3 years. When the land is prepared, the remaining residues of the former crops should be removed and then deep-rooted. In deep ploughing, the decomposed organic fertilizer can be sprinkled on the ground, and thoroughly mixed with the soil after deep turning. Generally, the base fertilizer is applied with organic fertilizers of 35,000 to 50,000 kg/ha, grass ash of 1,500 kg/ha, and superphosphate of 375 kg/ha. Shiji fertilizer is turned over again, and Pingping is made into a flat or north-south planting ditch. When the underground pests are serious, it is best to use biological pesticides to kill insects.
The standard for planting onion seedlings is: the average weight of a single plant is about 40 grams, the height is about 50 centimeters, the scallion is about 25 centimeters long, the scallion is about 1 centimeter thick, the tubular leaves are dark green, and each plant is not less than 5-6 pieces. Typical traits of this variety.
After planting, the summering period will not be watered, no topdressing, only shallow cultivating, more loose soil, timely grassing, improve soil aeration.
Onion has a long growing period and requires more fertilizer. Timely topdressing is an important measure for high yield and quality. At the beginning of the growth of scallion, the summer has just passed, the weather has turned cold, and the plant growth has gradually accelerated. It should be followed by 1 attacking leaf fertilizer, 225-300 kg/ha of compound fertilizer or 225 kg/ha of urea and potassium sulfate, or 15000 of decomposed organic fertilizer. ~22500 kg / ha, fertilizer ridge ditch, cultivating and mixing, squatting in the ditch, and then watering, can meet the demand for increased yield and increase of the leaves in time. In early September, it was the warm season for the growth of green onions, and the scallions entered a period of growth, which was the fastest period of production. At this time, the onion needs the most fertilizer, and should be placed on the fertilizer.
The amount of topdressing should be equal or slightly more than the first amount of topdressing. After top dressing, pour on both sides of the onion to make the original ridge back into a ditch, and timely water to meet the needs of the rapid growth of onion. From late September to early October, it is a period in which the onion photosynthetic products are accelerated to operate and the onion yield is significantly increased, and it is also the peak period of fertilizer requirement before product formation. Onions and wheat are cultivated in the main green onion producing areas of Shandong. At this time, it is the wheat sowing period. In order to make the wheat have sufficient base fertilizer, the topdressing should be applied once.
Generally, the organic fertilizer is 60,000 to 75,000 kg/ha, and the compound fertilizer is 375 kg/ha or urea, superphosphate, potassium sulfate, etc. are 100-150 kg/ha. This fertilizer has the dual function of ensuring the high quality and high yield of onion and the supply of intercropped wheat. After entering October, due to sufficient fertilizer, the number of leaves and leaf area have increased to the peak, so no top dressing is required.
Source: Guangdong Mountain Information Network
In the vast northern regions of China, most of the onions are planted in autumn and summer, and in winter, they are high-quality products - green onions. The warm areas of the south can be spring or autumn, and harvested in winter. This cultivation method has high yield, good quality and strong storability.
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